凹版胶印中网穴形状和接触角的研究

Gravure Shape and Contact Angle in Gravure-offset

目的研究利用凹版胶印方式印制电子产品必须满足的相关条件。方法从网形状的角度探究对"锯齿"边缘的影响,采用模拟分析的方法研究接触角对油墨转移的影响。结果 100%的油墨从网穴转移到橡皮布上必须满足cosθ像>1+cosθ版。如果采取圆形网点、椭圆形网点等其他形状的网点,无论在何种印刷压力下都会产生"锯齿"边缘;采用方形网点,在适当的印刷压力下可以降低甚至消除"锯齿"边缘。结论上板接触角与油墨的转移率呈负相关关系,下板接触角与油墨转移率呈正相关关系。印刷电子产品应当采用方形网点。

Objective To study the conditions to be satisfied when printing electronic products using gravure-offset. Methods The effects of dot shape on the saw-teeth edge were studied, and the effects of contact angle on the transferred volume and rate of ink were analyzed by simulation. Results The surface energy must meet cos 0. 〉 l＋cos 0 ~ so that the ink could be 100% transferred from the gravure plate to the blanket. If other dot shapes like round dot or oval dot were used, then saw-teeth edge occurred regardless of the printing pressure. However, using square dots could decrease or even eliminate the saw-teeth edge under appropriate printing pressure. Conclusion When the upper contact angle had a negative correlation with the ink transfer rate, and the lower contact angle had a positive correlation with the ink transfer rate, square dot should be used in printing of electronic products.